I’m going to hazard two guesses. One, you don’t have bluetooth turned on on your Mac. Two, the Sonos is already connected to one of the phones, and won’t pair with another device until you turn off the bluetooth on the device it’s already connected to. 

Thanks for the suggestion, but I do have it turned on, and no other device has it selected. In fact, I purposely told theater devices to Forget the Move.

Hmmm. Those were the two most likely potentials. Maybe you should contact Sonos Support directly to discuss it?

I usually suggest the phone folks, they have more tools available because they're on the phone with you, they are available Monday through Friday during business hours. The Twitter support folks are available 24/7. 

Thanks a lot. I’ll take your advice!